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Slee1,
Yes, that would be the passenger side of the block. If you roll under the car it is hard to miss. It will be all the way over on the right side of the block kind of above where the right side axle traverses across to the spindle assembly. Mind you it is a petcock and not a drain plug, which means you need only unscrew it and not remove it. Get yourself a piece of rubber hose that will fit snugly over the end of it, crack the fitting loose, install your rubber hose on the fitting and into a bucket on the other end and then loosen it enough that it flows freely. You will have to have the coolant reservoir cap off to get it to flow. A pressure tester is kind of hard to fake, you either have one or you don't. Typically it is a hand pump with a hose and an adapter to screw onto radiators with, from there you need your specific adapters to fit different cars. You screw the Volvo adapter onto the bottle and twist the standard connector from the pressue tester onto that and then pump it up to 12-18 psi. Yes this will help bleed the system, it will cause the air bubbles to congeal into one or two big bubbles and then they work their way out. I usually pressurize it once or twice, let the pressure off, top of the system, re-pressurize and let it set for 15-20 minutes to check for leaks and watch for any signifigant drop in system pressure, take the pressure off for the last time, top off level, fire it up and bring it to operating temp and make sure that the system now has pressure in it. This is as simple as removing the cap and listening for the release of pressure. Understand that the pressure only builds because the system is sealed and it heats the coolant up which expands, as it expands and the system is sealed the air is compressed to about 12-13 pounds or so. So, if you pop the cap a couple of times while it is warming up, you will have no pressure in the system because it releases everytime you open the cap. Every once in a while I get a car that leaves the shop with an air bubble still in it and invariably I will get a call the next morning about the coolant level light being on, just top it off one last time and it will be ok.
Mark
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